Fix #3775: Fix RefChecks#upwardsThisType #3776
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A non-applied class TypeRef is not a valid prefix for a TypeRef of a class type parameter, it causes an assertion error in NamedType#argDenot because args.nonEmpty ends up false.
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odersky
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Jan 15, 2018
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A non-applied class TypeRef is not a valid prefix for a TypeRef of a
class type parameter, it causes an assertion error in NamedType#argDenot
because args.nonEmpty ends up false.